Die head



May 31, 1932 H. T. SHEARE'R ET AL 1, 2

' DIE HEAD Filed Dec. 27. 1928 5 Sheets-Sheet 1 gwuentou H] T. SHEARERET AL DJ-IE HEAD May 31, 1932.

Filed Dec. 27,1228 5 Sheets-Sheet 2' ar/esAKeimsc/pfisel I May 31, 1932.H. T. SHEARER ET AL DIE HEAD 5 Sheets-Sheet 4 Filed Dec. 27, 1928 an wwMM Q w AN @V ANNQ NNNYSWM gwvento j; Harry I Shearer@harlesARa'mschisse) May 31; 1932.

H. T. SHEARER ET AL DIE HEAD 5 Sheets-Sheet 5 Filed Dec 27, 1928 gMmvnlou T5/7earer zlfeimschrssel har/es Patented May 31, 1932 UNITEDSTATES PATENT OFFICE.

nARRr T. snEA'nnR AND humans A. mzmscnrssnn or wAYNEsBono, rENNsYLvANIA, ASSIGNORS '1'0 LA nIs uAcnINn COMPANY, or WAYNESBORO, PENNSYL-vAN1A,A CORPORATION or PENNSYLVANIA DIE HEAD Application filed December27, 1928'. Serial No. 8283M Our invention relates to die heads, andparticularly to such die heads as are used on machines for cuttingthreads on bolts, screws, pipe, etc., using well-known tangential e'ndsharpened chasers.

An object of the invention is to provide a o'unit die head in which thefront unit carries the cutters for producing, the screw threads, and therear unit constitutes the holding or driving unit; and to provide meanswhereby the front unit may float relative to the rear or holding anddriving unit; and to provide further that the locking and drivingmembers shall be independent of each other.

A further object is to provide a die head in which a floating action issecured to the locking and closing members, and in which the lockingmembers are contained in the floating unit and are not influenced by theholding or driving unit.

A further object of the invention is to provide a die head wherein thelocking means is permitted to float with the thread cutting carryingmeans, and whereby the thread cutting carrying means and locking meansare permittcd to float relative to the die head holding shank.

A further object of the invention-is to provide a die head having afloating front unit in which the locking mechanism is unaffected by thefloating of the front unit.

A further object of the invention is to provide a die head composed oftwo units in which the front unit is driven by pins on the rear unit, sothat the driving or resultant forces are carried by the pins instcad ofby the closing and locking means.

In constructions heretofore used, the locking pins bore the resultantforces of the cut-1 ters, such constructions being shown and describedfor example in Patent #1,631,556,.

to Harry T. Shearer and'in Patent #1,692 514, to Samuel F. Newman andJames Harper.

In constructions heretofore used, as in application of Harry T. Shearer,Serial No. 597,199, filed October 26, 1922, the resultant forces of thecutters are carried by the trunnions and the worm connected to thedrivingshank or bod whereas in this construction the resultant orces arecarried by pins in the holding or driving unit which are independent ofthe trunnions, locking pins or worms and at the same time allows theopening act1on of the head to be pull-off type or selfcontained withoutrelying on mechanical means. such as spiders, yokes, cams, etc.

'Furthe'r general objects are to provide a die head in which the cuttingand locking members float relative to the driving shank or the drivingmember, and wherein misalignment of the work will not affect the lockingmeans. 7

A further object is to provide a die head in which the resultant forcesof cutting threads do not act through the lockin means to the holdingshank or driving member.

A still further object is to provide a die head employing tangentialchasers and trunnions mounted in a body carrying the same, In which theunit carrying the cutting members ahgns itself with the stock being cut,

. which stock can be eccentric with the shank or driving member withoutcausing a rocking action upon the locking pins.

A further object of the invention is to provide a die head having apull-off or separat-I ing action between front and rear units foropening the head in combination with conical closing pins and have thefront and rear units maintain their separate positions until the frontunit is again acted upon by the conical ins.

urther objects and advantages will becomeapparent as the descriptionproceeds. Referring to the accompan 'ng drawings, which are made a parthereo and on which similar reference characters indicate similar parts:

Figure 1 is a side view of the die head, Figure 2, a face view of thedie head, Figure 3, a face view of the die head with the chaser holdersand the trunnions removed, and in which the head is in locked Figure 6,a section on line 66 of Fig.,5, 5

showing the position of parts with the head open,

Figure 7 is a face view, showing the position of parts after the lateralmovement of the front unit has taken place,

Fig. 8 is a section on line 8-8 of Fig. 7

Figure 9 is a section on line 99 of Fig. 7, showing the position of,parts after lateral movement of the front unit has taken place,

Figure 10 is a section on line 10-10 of Fig. 5, with the die head open,and

Figures 11 and 12 show details of the locking pins and the locking pinbushings during closing of the head as shown in Figs. 7 and 8.

In the drawings, numerals 20 indicates the body member of the front unitof a die head having an opening ring 21 surrounding the front end, andan ad usting ring 22 surrounding the head body member just to the rearof the opening ring. The body member has a flange 23 made integraltherewith, for holding the opening ring from forward movement on thehead body. A ring plate 24 is secured on the rear face of the front unit20. Chaser holders 25 carrying tangential chasers 26 are mounted upontrunnions positioned in bores in the front head body member 20 andpivotally connected to the opening ring 21 so that relative rotation ofthe opening ring and the front head body member will open and close thethread cutting jaws or chasers. The opening ring 21 is provided withcavities in which are seated hardened bushings 27 and 27. The trunnionson the chaser holders pass through the rear ring plate 24 and aresecured by means of nuts 28 and lock nuts 29 having a conical end whichseats in a corresponding conical cavity in an end of the trunnion.

The rear unit of the head body comprises a rear body member 30 having arear flange portion 31. Surrounding the rear body memher are rings 32and 33. The locking ring 32 carries blunt end locking pins 34 securedtherein, which pins pass through bores in the adjusting ring 22 and seatin the bushings 27' in the opening ring to hold this ring in lockedthread cutting position. The closing ring 33 has pins 35 securedtherein, which pins have conical ends 36 which engage in hardenedbushings 27 in the opening ring. The pins 34 and 35 are so positionedwith respect to their respective bushings in the opening ring 21 thatthe conical pointed pins 35 will rotate the opening ring to suchposition that pins 34 assume a position relative to bushings 27 as shownin Figures 11 and 12 and the withdrawal of pins 35 from their bushings27 permits the opening ring 21 to assume its locked position as shown inFigures 3 and 4. When the front body member is pulled forward to allowthe cutters to open the forward ends of the blunt end pins 34 restagainst the rear face of the opening ring to hold the opening ring infixed open position relative to the driving member. A ring plate 37 issecured on the front end of the rear body member. The ring plates 24 and37 surround a small extension 38 on the rear of the front body member20. Screws 39 are secured in the rear of the front body member 20 andpositioned in bores of the rear body member 30. Compression springs 40surrounding these pins are positioned between the head 39 of the pins 39and the bottom 30 of the bore in the rear body member 30. These springstend to hold the body members together. In order to permit the frontbody member together with the opening ring and the adjusting ringsurrounding this body member and the closing ring and the locking ringsurrounding the rear body member, to have a floating action relative tothe rear unit, we provide clearances at 41, 42, 43, 44, and 44". Therings 32 and 33 are provided with cavities 45 and 46, respectively, inwhich are seated compression springs 47. These springs tend to urge therings apart. The rings 32 and 33 are limited in their lateral movementby the ring plate 37 and'the flange 31. In order to operate the closingring 33 we may provide a roller 48 upon some member 49 on a screwthreading machine, which roller 48 will strike against the flange 50 onthe ring 33 and force it forward, causing the conical points 36 toengage the sides of the bevel 27 of bushings 27. The said bushings 27are out of alignment with the closing pins 35 when the die head is open.Forward movement of the conical pointed pins 35 will rotate the ring 21until the locking pins 34 are seated in their corresponding bushings inthe opening ring 21 as described above. The ring 22 is adjusted aroundthe head body member 20 by means of a screw 51 which is the same as thestructure shown in the patents above referred to. The opening ring 21 ismoved to open position by well known means such as that shown in thepatents above referred to and as shown in Figure 2.

Driving contact between the rear body member 30 and the front bodymember 20 is made by pins 52 which are fixed in the rear body member andextend into bores in the front body member with clearance 44.

While we have shown means for closing the head by moving the ring 33forward to cause the conical ends of the pins 35 to rotate the ring 21with respect to the ring 22, we do not limit ourselves to this method ofclosing the die head to cutting position. Instead of this automaticdevice for closing the head, we may provide the ring 21 with a. handleby means of which it may be manually rotated so that the lockin g pins34 will seat in the proper bores in the openin ring.

' Means are provi ed to hold the front unit of the die head in a fixedposition while the head is being closed by the action of closing pins35. This is accomplished by stop screws 39 in conjunction with shoulder39 of bores in rear body member 30, the distance from under the "head 39to end of body 39 of screw 39 is such that when 36 is engaged on bevel27 of bushing 27 in the act of closing die head it will force front unitforward until 39 makes contact at 39 preventing further forward movementof front unit; the closing pins 35 being of such length, that as theycontinue in their forward motion their conical ends 36 will rotate ring21 until pins 34 assume a position relative to bushing 27, as shown inFigures 11 andl2, and the wlthdrawal of pins-35 from their bushings 27permits the opening ring 21 to assume its locked position as shown inFigures 3 and 4.

It will be obvious to those skilled in the art that various changes maybe made in our device without departing from the spirit of theinvention, and we therefore do not limit ourselves to what is shown inthe drawings and described in the specification, but only as set forthin the appended claims.

Having thus fully described our said invention. what we claim as new anddesire to secure by Letters Patent, is:

1. A die head comprising a body member, trunnions mounted in the bodymember, chaser holders mounted on the trunnions, tangential chasers inthe holders, a plurality ofrings surrounding the said body member, oneof said rings be'ingconnected to the said chaser holders, means in saidrings for openin g and adjusting the die head, the said rings beingpositioned. laterally of said body member by a flange on the bodymember, and a ring plate attached to the said body member, a ringcarrying locking pins connected to the said plurality of rings androtatable about the body member with said plurality of rings, said ringbeing positioned on ashank slidably connected to said body member, thesaid ring being limited in its axial movement relative to said shank forlocking the die head and pins mounted in the said shank for driving thesaid body member, substantially as set forth.

2. A die head comprising a two unit head body member, the front [unitcarrying openmg and ad usting rings and the rear unit carrying lockingand closing rings, plns on the locking ring of the rear unit and pins onthe closing ring of therear unit, the said last named pins havingtapered points which seat in bushings in the opening ring, wherebyforward movement of the closing ring will rotate the opening ring to a.position whereby the locking pins on the lockingring will semember, thesaid closing ring having .closing pins extending throughthe said lockingring and into bores in the opening ring, the said pins having taperedpoints which rotate the opening ring to a position wherein it is lockedin thread cutting position by the pins on the locking ring whereby theforces resulting from thread cutting operations act through the lockingmeans instead of through the closing means to the head holding shank ordriving member, substantially as set forth.

4. A thread cutting die head comprising a front unit and a rear unit,the front unit carrying opening and adjusting rings and chaser holderscarrying thread cutting chasers mounted thereon, the rear unit carryinglocking and closing rings with locking and closing pins secured therein,there being clearances provided between the said locking and closingrings and the rear body member whereby the front unit may have afloating action to care for misalignment of Work without affecting theposition of the rear body member and without affecting the rela tiveposition of the opening and the locking rings, substantially as setforth.

5. A" die head comprising a head body, a driving member, an openingring, an adjusting ring, a locking ring, a closing ring, meanscomprising conical pins mounted in the closing ring for closing thehead, and means comprising blunt end pins mounted in the locking ringfor locking the head in closed position, substantially as set forth.

6, A die head comprising a head body, a.

driving member, an opening ring, an adj ust- 1ng rmg, a locking rlng, aclosing ring, means comprising conical pins mounted in the closing ringfor closing the head, means comprising blunt end pins mounted in thelocking ring for locking the head in closed position and means providedfor holding the head body, the opening ring and the adjusting. ring infixed open position relative to the driving member, the locking ring andthe closing ring, substantiall as set forth.

7 A die head comprising a head body, a driving member, an opening ring,an adjusting ring, a locking ring, a closing ring, means comprisingconical pins mounted in the closing ring for closing the head, meanscomprising blunt end pins mounted in the locking ring for locking thehead in closed position and means comprising springs mounted betweensaid locking ring and said closing ring for withdrawing said conicalpins from closed position, substantially as set forth.

8. A die head comprising a head body, a driving, member, an openingring, an adjusting ring, a locking ring, a closing ring, meanscomprising conical pins mounted in the closing ring for closing thehead, means comprising blunt end pins mounted in the locking ringforlocking the head in closed position and means comprising pins mounted1n the driving member for driving said head body and said rings duringthread cutting 5 operation, substantlally as set forth.

9. A die head comprising a head body, a driving member, an opening ring,an adjusting ring, a locking ring, a closing ring, means comprisingconical pins mounted in the closing ring for closing the head, meanscomprising blunt end pins mounted in the locking ring for locking thehead in closed position and means for maintaining the opening ring andthe adjusting ring in fixed lateral relation to said head body and meansfor maintaining the locking ring and the closing ring in fixed lateralrelations to said driving member, substantially as set forth.

10. A die head comprising a head body,

a driving member, an opening ring, an adjusting ring, a locking ring, aclosing ring, means comprising conical pins mounted in the closing ringfor closing the head, means comprising blunt end pins mounted in thelooking ring for locking the head in closed position andmeans to limitthe lateral movement of the locking ring in relation to the drivingmember to open the die head, substantially as set forth.

11. A die head having a two unit head .body member, the front unitcarrying opening and adjusting rings and the rear unit carrying lockingand closing rings, said closing ring carrying conical pointed pinsengageable in sockets in the opening ring for moving said opening ringto close the die head, clearances being provided between said lockingand closing rings and said rear unit, pins mounted in said rear unitregistering with recesses in the front unit, tapered clearancesbeingprovided about said pins in said recesses whereby the front unitand its opening and adjusting rings with said locking and closing ringsare permitted to float relative to the rear unit, substantially as setforth;

In Witness whereof, we have hereunto set our hands at Waynesboro,Pennsylvania, this eleventh day of December, A. D. nineteen hundred andtwenty-eight.

HARRY T. SHEARER.

CHARLES A. REIMSCHISSEL.

